Jack Wolfskin Rock Surfer 18.5 Backpack style:1.shell: 100% polyamide; 2.shell: 100% polyamide; lining: 100% polyester Imported Fully featured bike pack with easy-adjust Velcro waist belt Flexible, snug-fit suspension system Helmet attachment, stowaway waist belt Attachment for LED light, rain cover Equipped for a hydration system